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第3回
超音波探傷試験によるき裂深さサイジングの信頼性に関する検討
著者:
古川 敬,Takashi FURUKAWA,古村 一朗,Ichirou KOMURA,米山 弘志,Hiroshi YONEYAMA,山口 篤憲,Atsunori YAMAGUCHI
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This paper describes two contents about reliability of crack depth sizing on ultrasonic testing. One is verification with appropriate acceptance cr iteria of the Japanese Performance Demonstration Code (NDIS 0603 Appendix) . Another is investigation about the true crack depth measurement method....
英字タイトル:
Reliability of Crack Depth Sizing on Ultrasonic Testing
第3回
軽水炉圧力容器鋼溶接部の照射脆化評価技術
著者:
熊野 秀樹,Hideki YUYA,鈴木 哲也,Tetsuya SUZUKI,肥田 茂,Shigeru HIDA,木村 晃彦,Akihiko KIMURA
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The ductile-brittle transition behavior of neutron-irradiated welded A533B Cl.1 steel has been studied by means of small specimen test technique for discussing the specime n size effects on the impact properties. Standard size, one-third size and 1.5mm size Charpy V-notch specimens were prepared. Neutron irradiation was performed in JMTR wit h fluencies up to 0.75 and 1.3 X 1024 n/m°(E>1 MeV). Normalization of the USE is done by a curve fitting method and the USE of different size of specimens can be expre...
英字タイトル:
Evaluation Technique of Neutron-Irradiation Embrittlement in Welded RPV
第3回
軽水炉環境下における応力腐食割れき裂進展に伴うき裂先端塑性ひずみ分布の有限要素解析
著者:
土屋 暢久,Nobuhisa TSUCHIYA,渡辺 公雄,Kimio WATANABE,竹田 陽一,Yoichi TAKEDA,呂 戦鵬,Zhanpeng LU,庄子 哲雄,Tetsuo SHOJI
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Plastic strain as a function of the distance from a growing stress corrosion crack tip is quantitatively evaluated by three-dimensional ela stic-plastic finite element analysis. The strain distribution obtained by node-release simulation of crack growth follows the logarithmic l aw. The criteria for the transition from a stationary crack to a growing crack were investigated. Results suggested that the prediction of crack growth by the FRI model, in which oxidation kinetics and continuum mechanics has been...
英字タイトル:
Finite Element Analysis of Plastic Strain Distribution at a Distance from Growing Stress Corrosion Crack in Light Water Reactor Environment
第3回
送受信分割型マトリクスアレイ探触子による ステンレス鋼溶接部欠陥サイジング技術の開発
著者:
石田 仁志,Hitoshi ISHIDA,黒住 保夫,Yasuo KUROZUMI,藤井 登,Noboru FUJII
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A twin matrix array transducer to make possible to detect and measure a flaw with test direction through weld of austenitic stainless steel has been developed. Each transducer performs as transmitter and receiver and has 2 lines and 16 columns array elements respectively. With this transducer depth measurement tests for cracks by stress corrosion cracking (SCC) and fatigue on austenitic stainless steel weld pipe specimens have been carried out.As the results: (1) Corner echoes and ti p echoes from SCCs ...
英字タイトル:
Development of Depth Measurement Technique for a Flaw in Weld Area of Stainless Steel with Twin Matrix Array Ultrasonic Probe
第3回
連続超音波探傷技術を用いた、設備の劣化検査と寿命予測
著者:
佐藤 信義
発刊日:
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1. はじめに高圧ガス保安協会が発表している高圧ガス製造事業所事故件数の推移データによれば、事故は増加傾向にあり、その 主な原因の1つは腐食劣化であることが知られている。高経年化・老朽化が、その背景にあることは、疑いのない事実 であろう。高経年化設備のメンテナンスでは、劣化管理の網羅性が重要であり、さらに劣化程度を適切に見極め評価す るための、検査、診断、寿命予測、及びデータ管理等の技術が重要である。 2. 劣化確認方法 図1は、設備劣化の確認方法を表す。この中で、高経年化・老朽化プラントの腐食劣化に最も......
第3回
運用・保守段階での機能向上を考慮したプラント保全モデルの基礎的検討
著者:
妻屋 彰,Akira TSUMAYA,井上 和也,Kazuya INOUE,望月 正人,Masahito MOCHIZUKI,若松 栄史,Hidefumi WAKAMATSU,荒井 栄司,Eiji ARAI
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This study proposes a maintenance activity model that considers not only routine maintenance activity but also functional mainte nance including improvement/modification Required maintenance types are categorized, and limitation of Activity Domain Integrati on Diagram (ADD) proposed by ISO18435 are discussed based on framework for life cycle maintenance management of manufacturing as sets. Then, we proposed extension ADD model for plant maintenance activity model considering functional improvement/modifica...
英字タイトル:
Basic study of the plant maintenance model considering plant improvement/modification
第3回
配管内面軸方向応力腐食割れ試験法とき裂進展挙動
著者:
佐藤 康元,Yasumoto SATO,荒井 健作,Kensaku ARAI,庄子 哲雄,Tetsuo SHOJI
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The test methodology using specimens in the shape of tubes was developed to create axial SCCs on the inner w all of the specimen, and its effectiveness was verified by performing SCC tests under LWR environment. It w as shown that the axial stress corrosion cracking was generated from the deepest point of pre-crack by modif ying the loading mode, though the crack was not created around the loading point due to compressive stress....
英字タイトル:
Stress Corrosion Cracking Test Methodology for inner axial cracks and its cracking behavior
第3回
閉じたき裂の熱応力開口挙動について
著者:
燈明 泰成,Hironori TOHMYOH,坂 真澄,Masumi SAKA
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This paper presents the ultrasonic response for closed crack under thermal loading. A part of stainless steel plate with a tightly closed crack is cooled for three minutes, and the therm al stress for reducing the crack closure stress is generated in the plate specimen. The back -scattering wave from the crack surface is monitored for several hours after cooling started....
英字タイトル:
Behavior of Closed Crack under Thermal Loading
第3回
閉口き裂を映像化する非線形超音波フェーズドアレイの基礎的検討
著者:
Kazushi YAMANAKA,Setsu YAMAMOTO,Yoshikazu OHARA,Tsuyoshi MIHARA
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A new method for detection and sizing of closed crack is described which uses transient waveform of subharmonics with half input frequency i n ultrasonic nondestructive evaluation. In analogy to the resonant characteristics of vibration of bubbles in liquids, we formulate an equat ion for resonant excitation of subharmonics at partially closed cracks. The equation has been partially verified by comparison between exper imental and calculated waveforms. An apparatus for imaging closed cracks in critical com...
英字タイトル:
Nonlinear Ultrasonic Imaging Method for Closed Cracks
第3回
閉塞枝配管における熱成層化現象解析
著者:
池田 浩,Hiroshi IKEDA,中田 耕太郎,Kotaro NAKADA,室伏 正,Tadashi MUROFUSHI
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The cavity flow is driven by the main flow where the branched flow from main pipe in plants is stagnant. Heat of main flow is transported to the branch pipe and the thermal stratification is formed in the branch pipe. It is necessary that the locatio n of thermal stratification can be predicted in order to estimate the thermal fatigue of pipe wall. This study predicts the location of thermal stratification using numerical simulation, and showed the prediction has good agreement with experiments....
英字タイトル:
Numerical Simulation of Thermal Stratification in a Branch Pipe
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